Mechanical movement



(No Model.)

J. W. REID,

MEGHANIUAL MOVEMENT. No. 253.426. Patented Feb. '7, 1882.

UNIT D STATES PATENT OF ICE.

JOHN W. REID, OF CHICAGO, ILLINOIS.

MECHANICAL MOVEMENT.

SPECIFICATION forming part of Letters Patent No. 253,426, dated February 7, 1882.

I Application filed November 18, 1881. (N model.)

To all whom it may concern Be it known that I, JOHN W. REID, of Ohicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Mechanical Movements and I hereby declare the following to be a full, clear, and exact description thereof, which will enable others skilled in the art to which my invention relates to make and use the same, referresistance of a weight fulcrnmed and operated as shown in the drawings.

a represents such a weight fulcrnmed at 0, to which is attached a cord, 8, above the fulcrum. Said cord passes under a fixed pulley, p, at about or near the level of the hinge 0, and from thence upward, and is attached to a'spiral or comically-formed pulley, A, on the shaft I). Said spiral pulley may be arranged so as to have any number of spiral turns, and so as to turn loosely on the shaft 1) or be firmly attached thereto. Upon the same shaft is attached another spirallyfornied pulley, B, but with the path of its spiral turning in theopposite direction. The pulleyAis shown in full lines and B in dotted lines in the elevation. The cordssand r are each attached to the apex of the cones A and B, respectively.

To the cord r is attached a weight, w, and,

' as shown, is suspended from the base of its cone B. It is evident from the arrangement shown in the drawings that the weight 20 will overcome a many times greater weight or resistance on the cord 8, and will consequently raise a large weight, a, fulcrnmed at 0, as shown. It is also evident that the weight a in its present position will offer its greatest resistance, and as it rises or turns around its fulcrum 0 will offer a constantly-decreasing resistance, until it is finally brought over the point 0, so as to balance itself thereon, and that a weight, w, acting over an ordinary pulley giving a uniform power, would actv with great violence on the weight a. when it came to the point where it is balanced over the point 0, whereas in the construction here shown the weight to acts with its greatest force at the point of greatest resistance of the weight a, and as it rises the cord r unwinds toward the apex 0, its power thereby constantly-decreasing, and at the same time the cord 8 runs gradually toward the base 0, thus giving a constantly-decreasing resistance to the weight a as it correspondingly exerts less force. By this construction I obtain a mechanism whereby a uniform force or weight, to, applied to a, will bring it from the horizontal to the vertical position, or vice versa, with equal facility and by a uniform weight.

It is evident that by skillful construction of the spiral pulleys the weights may be made to balance each other at any point in the range of their motion, so that by a. power so slight as to merely overcome the friction the body a may be moved.

The cones may work upon a shaft, 1), as shown,

the base of one attached to the apex of the other, or they may be constructed base to base, or vice versa; but in case they are loose upon their shaft they must be firmly attached to each other, and must always turn together in the same way. The pulley 10 may also be omitted and the cord 8 attached to the forward or free end of the weight a, and the same results be obtained.

What I claim as new, and desire to. secure by Letters Patent, isp 1. In combination with the spiral pulleys A and B, constructed and arranged to operate together on a shaft, b, the fulcrnmed weight a, cords s and r, and weight to, substantially as and for the purpose specified.

2. The fulcrnmed weight a, suspended weight w, pulley p, and cords s and r, in combination with the spiral pulleys A and B, constructed and arranged substantially as specified.

3. The spiral pulleys A and B, constructed as shown, provided with cords s and r, attached as shown, the cord 1', provided with a weight, w, and the cord 8, attached, as shown, to a fulcrnmed weight, or, offering a variously increasing or decreasing resistance, substantially as specified.

JOHN W. REID. Witnesses:

WM. ZIMMERMAN, ORVILLE G. RORABAUGH. 

